Defense Primer: Junior Reserve Officers' Training Corps (JROTC) [Updated January 7, 2020] [open pdf - 609KB]
From the Overview and Mission: "The Junior Reserve Officers' Training Corps (JROTC) is a voluntary high school program of instruction administrated by the Department of Defense (DOD) through the military departments. The purpose of JROTC, according to 10 U.S.C. §2031, is 'to instill in students in U.S. secondary educational institutions the value of citizenship, service to the United States, and personal responsibility and a sense of accomplishment.' JROTC was established as an Army program by the National Defense Act of 1916 (P.L. 64-85) and in 1964 expanded to the Navy and Air Force. Congress authorized Coast Guard units at two specific schools: one in 1989 (P.L. 101-225) and one in 2005 (P.L. 109-241)."
CRS In Focus, IF11313
Congressional Research Service: https://crsreports.congress.gov/